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Related Experiment Video

Updated: Oct 7, 2025

Author Spotlight: Exploring Olfactory Influences on Corticospinal Excitability - Insights and Innovations in Neurological Research
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Analysis of conductive olfactory dysfunction using computational fluid dynamics.

Youji Asama1,2,3, Akiko Furutani1,3, Masato Fujioka2

  • 1Asama Institute, Asama-ENT-Clinic, Koga, Ibaraki, Japan.

Plos One
|January 12, 2022
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Summary

This study reveals that nasal obstruction in conductive olfactory dysfunction (COD) reduces airflow velocity in the olfactory cleft, impacting smell. Increased nasal resistance promotes mouth breathing, worsening olfactory symptoms.

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Area of Science:

  • Otolaryngology
  • Respiratory Physiology
  • Medical Imaging

Background:

  • Conductive olfactory dysfunction (COD) presents with fluctuating smell loss, often without clear anatomical causes in the olfactory cleft.
  • Nasal cavity obstructions are primary causes of COD, but mechanisms in anatomically normal cases are unclear.

Purpose of the Study:

  • To investigate olfactory cleft airflow dynamics in patients with conductive olfactory dysfunction (COD) using computational fluid dynamics (CFD).
  • To identify correlations between nasal resistance, breathing patterns (nasal vs. mouth), and olfactory cleft airflow in COD.
  • To analyze the impact of morphological abnormalities, such as concha bullosa, on airflow.

Main Methods:

  • Retrospective cohort study using cone beam computed tomography (CBCT) scan data from COD patients.
  • Computational fluid dynamics (CFD) simulations to analyze airflow in the olfactory cleft.
  • Measurement of nasal-nasopharyngeal pressure at maximum flow to differentiate breathing patterns.

Main Results:

  • A cut-off pressure value was established to distinguish nasal from combined mouth breathing in COD patients.
  • Increased nasal resistance was found to promote mouth breathing.
  • Significantly reduced velocity and flow rate in the olfactory cleft were observed in COD patients with exclusive nasal breathing compared to healthy controls.
  • Analysis of common morphological abnormalities like concha bullosa was performed.

Conclusions:

  • Novel insights into the pathophysiology of conductive olfactory dysfunction (COD) are provided, linking nasal airflow dynamics to smell impairment.
  • Findings have implications for surgical planning in COD, sleep apnea research, pediatric adenoid hyperplasia assessment, and sports respiratory physiology.